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-2- <br />• <br />surface elevation. The principal spillway has been designed and <br />elevation set to allow a minimum of 24 hours holding during the 10- <br />year, 24-hour precipitation event. In addition to these design con- <br />siderations, a permanent pool elevation has been established to allow <br />storage of water rights from the Eckman Park area. <br />As currently planned, the embankment is approximately 26 feet in <br />height at the maximum section and has a total length of about 600 feet. <br />The water surface for the 10-year, 24-hour precipitation event is ap- <br />proximately elevation 6938. Under normal operating conditions, the <br />water surface will be at approximately elevation 6930. A Class I haul <br />road is planned for future construction downstream of the dam. The haul <br /> road will buttress the clay fill embankment. For the 100-year event, <br />• the water surface elevation is approximately 6943. The crest of the dam <br />embankment at the lowest point will be 6945.5. An emergency spillway will <br />be provided with an invert elevation at 6939.5. Considering the height <br />of the haul road embankment, the combined haul road and dam embankment <br />have sufficient structural characteristics to contain the PMP without <br />overtopping. The haul road has a crest elevation of 6956 at the lowest <br />point without considering the required safety berms on either side of <br />the haul road. Both the dam and haul road will be constructed with <br />camber to allow for settlement. The anticipated sediment volume is ap- <br />proximately 50 acre-feet at elevation 6929.3. The total volume at eleva- <br />lion 6938 is approximately 220 acre-feet. The structure <br />• <br />